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地质学报  2005 

广东河源白石冈岩体:一个高分异的Ⅰ型花岗岩

, PP. 503-514

Keywords: 高分异Ⅰ型花岗岩壳幔相互作用地球化学岩石成因广东白石冈岩体Ⅰ型花岗岩岩体Rb/Sr比值分异河源

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Abstract:

广东河源白石冈岩体位于近东西向展布的佛冈花岗岩带的东端,主体岩性为中粗粒黑云母花岗岩,主要组成矿物为石英(25%~35%)、微纹长石(45%~50%)、斜长石(An=20~30,15%~20%)和黑云母(5%~10%).锆石U-Pb定年结果表明其形成年龄为148.5±1.6Ma,属晚侏罗世岩浆活动的产物.化学成分上,该岩体铝弱过饱和,A/NKC值主要变化于1.0~1.1之间;富硅,富钾(K2O/Na20=1.31~1.70),全碱含量中等偏低(K2O+Na2O=7.44%~8.48%),碱铝指数(AKI值)为0.75~0.88,可归为高钾钙碱性岩系.微量和稀土元素组成上,岩体富Rb、Th、U、Pb和轻稀土,贫Ba、Sr、P、Ti,Rb/Sr比值高,K/Rb比值低,铕负异常显著(δEu=0.05~0.28),Nb、Ta、Zr、Hf等高场强元素含量及104×Ga/Al比值(2.43~3.26)较之典型A型花岗岩均偏低.岩体的εNd(t)值为-5.99~-7.51,TDM值偏低(1.42~1.54Ga),综合地球化学资料指示其应属高分异的Ⅰ型花岗岩.结合对区域动力地质背景的全面分析,表明白石冈岩体形成于后造山的伸展引张环境,是由底侵的幔源基性岩浆及其诱发的长英质岩浆在深部岩浆房混合,并经高程度分离结晶的产物.

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